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Sensors 2012, 12(1), 1014-1034; doi:10.3390/s120101014

Optimal Methods of RTK-GPS/Accelerometer Integration to Monitor the Displacement of Structures

Department of Civil, Architectural & Environmental Engineering, Sungkyunkwan University, Suwon 440-746, Korea
Author to whom correspondence should be addressed.
Received: 24 November 2011 / Revised: 6 January 2012 / Accepted: 9 January 2012 / Published: 17 January 2012
(This article belongs to the Section Physical Sensors)


The accurate measurement of diverse displacements of structures is an important index for the evaluation of a structure’s safety. In this study, a comparative analysis was conducted to determine the integrated RTK-GPS/accelerometer method that can provide the most precise structure displacement measurements. For this purpose, three methods of calculating the dynamic displacements from the acceleration data were comparatively analyzed. In addition, two methods of determining dynamic, static, and quasi-static displacements by integrating the displacements measured from the RTK-GPS system and the accelerometer were also comparatively analyzed. To ensure precise comparison results, a cantilever beam was manufactured onto which diverse types of displacements were generated to evaluate the measurement accuracy by method. Linear variable differential transformer (LVDT) measurements were used as references for the evaluation to ensure accuracy. The study results showed that the most suitable method of measuring the dynamic displacement with the accelerometer was to calculate the displacement by filtering and double-integrating the acceleration data using the FIR band-pass filter. The integration method that uses frequency-based displacement extraction was most appropriate for the integrated RTK-GPS/accelerometer method of comprehensively measuring the dynamic, static, and quasi-static displacements. View Full-Text
Keywords: RTK-GPS; accelerometer; integration; displacement monitoring RTK-GPS; accelerometer; integration; displacement monitoring

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hwang, J.; Yun, H.; Park, S.-K.; Lee, D.; Hong, S. Optimal Methods of RTK-GPS/Accelerometer Integration to Monitor the Displacement of Structures. Sensors 2012, 12, 1014-1034.

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